Funny 13th Birthday T-Shirt - Square Root of 169

This humorous t-shirt is perfect for celebrating a 13th birthday! The design features a bold square root symbol over the number 169, followed by the phrase "Years Old." The clean, simple graphic stands out. Made from a comfortable, breathable fabric, this tee is ideal for everyday wear. It's a fun and memorable way to mark the transition into teenage years. Great for parties, gifts, or just showing off your age with a bit of math humor!